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Form Elements

Hi, I am trying to retrieve the values of my form once it has been submitted and post it to a third party. I have my key but I'm not sure how to get my value from the form into the value part of my code. Please help. This is my code...

$('form').submit(function(evt) {

    var postData = {
        "name": "",
        url : 'THIRD PARTY URL',
        headers: { "Content-Type":"application/json","Accept": "application/json", "X-APIKEY":"28V01143T5QL7il0W1748Pi7tlP3bMMB"},
        xhrFields: {withCredentials: false },
        type : 'POST',
        data: JSON.stringify(postData),
        contentType: "application/json",
        success : function (data) {
        error : function (data, errorThrown) {